1. WP11: CDS-SL CDR Overview
April 19th 2017
WP11: CDS-SL CDR Overview

2. ESS MACHINE The European Spallation Source (ESS) LINAC
CNRS CONTRIBUTION (CNRS/IN2P3/IPNO)
Moderated neutrons To experiments lines P
SRF LINAC: ~312 m
LENGTH:
SRF cavity cooling: 2 K in saturated He II bath ( simple techno.+ few energy stored + pressure control)
Design, construction and installation of the Spoke section (~56 m)
Elliptical section (~256 m):
design of the 30 cryomodules
(collaboration with )
Design, construction and installation of the cryogenic C&C system of theLINAC

3. ESS Spoke section Spoke section overview 13 Spoke cryomodules (CM)
Cryogenic Distribution System for Spoke linac (CDS-SL)
main four-channels cryoline (headers)
13 valve boxes (VB): one for each Spoke cryomodule
1 end box: to return flow to the cryogenic plant (ACCP)
13 branch cryolines (cryogenic jumper): connection from headers to each CM
auxiliary process lines
1 part of the vent line
Spoke cryomodule
End box 
Beam direction
Valve box
To the CDS-EL and ACCP

4. ESS Spoke section Spoke section overview
Cryogenic Distribution System for Spoke linac (CDS-SL)
main four-channels cryoline (headers)
1 End Box: to return flow to the cryogenic plant (ACCP)
auxiliary process lines
1 part of the vent line
End Box
Auxiliary lines
Valve box
Headers
Vent line

5. Interface with the CDS-EL
ESS Spoke section
Spoke section overview: the Cryogenic Distribution Line
Components
HU03
HU02
End box
VB01
VB02
VB03
VB13
Interface with the CDS-EL
Beam direction x y
HU-EL
TCS axis
HU01
HU13
Spoke cryomodules
13x valve box (VB)
13x (standard) Headers Unit (HU)
1x Elliptic interfaced Headers Unit (HU-EL
1x End box

6. Interface with the CDS-EL
ESS Spoke section
Spoke section overview
Flexible components
HU03
HU02
End box
VB01
VB02
VB03
VB13
Interface with the CDS-EL
Beam direction x y
HU-EL
TCS axis
HU01
HU13
Flexibility wrt the cryomodules cryo. distribution
valve box (VB)
Flexibility of the CDS-SL
(standard) Headers Units (HU)
Elliptic interfaced Headers Unit (HU-EL)
1x End box
Flexibility wrt the vent line

7. Spoke section overview
Flexible components (vacuum vessel and cryolines)
Header Unit
Auxiliary lines
Valve box
Beam direction
Flexibility
Flexibility
Flexibility

8. Interface with the CDS-EL
ESS Spoke section
Spoke section overview
Supports of the cryolines (with respect to the vacuum vessel) x y
TCS axis
Beam direction
HU01
HU02
HU03
HU13
HU-EL
VB01
VB02
VB03
VB13
End box
Interface with the CDS-EL
Centring (sliding) support wrt the vacuum jacket
Free Rx, Ry, Rz
Tx free; Ty0; Tz0
Centring support wrt the vacuum jacket
Fixed displacement along the beam axis
Free Rx, Ry, Rz
Tx0; Ty0; Tz0
Rx=0, Ry=0, Rz=0
Tx=0; Ty=0; Tz=0
Centring support wrt the vacuum jacket
Fixed displacement along the beam axis

9. Main components of the CDL
Valve box
Valve box support
Positioning frame
Interface with the Header unit
Fiducials supports
Cryogenic valves
Interface with the cryomodule
He relief branch line

10. Main components of the CDL
Headers units
Support frame
Handling and positioning frame (to be removed after installation)
Installation tooling (compression and positioning of the bellows)

11. Main components of the CDL
End Box

12. Design framework
European Pressure Equipment Directive (PED 2014/68/UE)
EN 13445: Unfired pressure vessels
EN13480: Metallic industrial piping
EN 13458: Cryogenic vessels – Static vacuum insulated vessels  End Box
gives rules for:
Design
Materials
Manufacturing
Installation
Tests
Maintenance
AFS 2005:2

13. Design framework Pressure Equipment Directive (PED 2014/68/UE)
Process lines:
 Category I for CDS-EL
 Category I for CDS-EL
 Category I for CDS-EL

14. Design framework Pressure Equipment Directive (PED 2014/68/UE)
End Box: cryogenic pressure vessel
VLP MAWP = 5 barg
 cat I for CDS-EL
 §3.3 for CDS-SL) 50
Aim: to remain in category I
Max. volume of the End Box helium tank (50 L)

15. STATUS Valve box Design nearly finished Procurement phase
Headers Units
End Box
Design under progress (tank supports)
Auxiliary lines
Support frames

16. End Box status Function of the End Box: To return the flow to the ACCP
To smooth the heat loads changes
Design concepts
From He supply to VLP
12.3 g/s (up to 27.1 g/s)
Helium liquefaction (JT)
Benefit from phase change
 T° fixed by pressure
the vapours flowing back to the ACCP starts from saturated vapours at a fix T°
Needs to produce vapours from liquid
JT does not need to be very efficient (no subcooling heat exchanger)
Need of heaters (170 to 382 W)
Heat loading of the LHe is allowed
Vapours flowing from the End Box (VLP)
Limit heat loads on the vapours

17. End Box status Goal: Design Support of the LHe is to finalize
(comply with pressure loading due to “end effect”)
Pipe routing is finished
(burst disk connection to vent line is to be confirmed: depends on the helium collector design)
Thermal shield is integrated
Vacuum vessel is designed
Analyses
Mechanical: to finalize LHe support
Thermal analysis: under progress (support)
Thermoacoustic: done

18. REQUIREMENTS List of requirements
A list of 117 requirements was established
All requirements concerning the CDS-SL are validated
Most of the interface requirements are agreed and validated
But:
We have to procure or complete some interfaces sheets describing the interfaces

19. WP11 : Cryogenic Distribution System for the Elliptical Linac
WP is interfaced with
WP04: Spoke cryomodules
Cryogenic branch lines (including the cryogenic jumper)
WP11 : Cryogenic Distribution System for the Elliptical Linac
Main process lines (headers)
Auxiliary lines
Safety devices
WP12 : Vacuum
Pumping ports
Diagnostic
Control ports (diagnostic and pumping if required)
WP13 : Safety
(Safety devices)
Burst disks
Vent line
WP15 : Cabling & Conventional Power
Instrumentation and actuators
ICS : Control/Command

20. REQUIREMENTS List of requirements WP04: Spoke cryomodules
List not validated by WP4
 to be validated with the cryogenic jumpers designs (WP4 and WP11)
WP11 : Cryogenic Distribution System for the Elliptical Linac (CDS-EL)
List completed and several iterations. In Chess?
WP12 : Vacuum
List completed and validated. In chess?
WP13 : Safety
Requirements concerning MAWP and safety devices were written as interface requirements with CDS-EL  validated. In Chess?
Helium collector:
ESS does not want to establish requirement  ESS and IPNO agreed to postpone the design of the vent line. When?

21. REQUIREMENTS List of requirements WP15 : Cabling & Conventional Power
No requirement needed
List of cables established
WP99 :AccelInfrastructure & Installation
Requirements list validated
ICS : Control/Command
No requirement yet written
List of instrumentation written and discussed with ESS

22. PROTOTYPING CNRS’ contribution to ESS Prototype Cryomodule
Prototype Valve box
and test
ESS Series cryomodules
IPNO
Uppsala univ.
Uppsala univ.
A prototype and test valve box:
Prototype valve box  to validate the valve box concepts
 to validate the prototype Spoke cryomodule
Test valve box  to validate 13 series Spoke cryomodules
 Compromise between an optimized test stand and a demonstrator (cryoprocess, assembly)
A versatile (flexible) valve box
Tests at IPNOrsay (FRANCE)
Tests at Uppsala University (SWEDEN)
 To manage different cryogenic infrastructures

23. PROTOTYPING
Prototypes
CRYOGENIC JUMPERS
VALVE BOX
SPOKE CRYOMODULE

24. Prototyping the Spoke section
Flow scheme (PID): prototype version
Main differences with machine:
Instrumentation
Saturated LHe supply
Saturated LN2 supply
 phase separator in the VB
 same subcooler
 RF coupler heat intercept
cold sat vapours used (instead of SHe)
 Interfaces with the infrastructures

25. Prototyping the Spoke section
Valve Box
Delivered in September 2016 (delay = 9 months)
But not the cryogenic jumpers…
Cool-down and operation at 4 K  some minor problems detected but tests were OK

26. Prototyping the Spoke section
Cryogenic jumpers
After delivery of the cryogenic jumpers in November
Connection of the cryomodule and… troubles with the both cryo jumpers:
- delivered bellows (inside the jumpers and covered by MLI) were not corresponding to the manufacturing drawings
- cryogenic jumpers pressure test tools were not well sized
 damaged bellows  leaks
Everything was done (and tried) to perform a cryo test
some components changed and repair at IPNO
(with on-stock components)
but VB jumper finally repaired by the manufacturer
CM jumper modified by IPNO (to use in-stock components):
VLP branch line was modified (DN40 inside a DN100 !)
Exhaust burst disk line modifed: DN100  DN40 (use of mock-up cavities so beam
vacuum loss incident is not considered)

27. Prototyping the Spoke section
2K test
- March: cryomodule and valve box connected
Configuration "not optimal" (or the worst possibel configuration) as:
1 magnetic shield not cooled
1 power coupler double-wall installed but not cooled
VLP branch line modified abd heat intercept suppress
Configuration "not optimal" (or the worst
- But 4 K and 2 K cryogenic tests were performed
with the Spoke cryomodule and test valve box
- Heat loads were important (but as evaluated)
- Liquid level regulations loop were tested successfully at 4 K and 2K
 LHe II level was correctly maintained in the cryomodule cavities

28. CNRS - WP11 The team P. DUTHIL V. POUX V. LAURENCIER M. PIERENS
Work Unit leader
Cryogenics, numerical analysis, procurements WP4: same activities
M. PIERENS
Cryogenics, instrumentation
WP4: instrumentation and tests
WPxx (C&C): WP leader
D. REYNET
System engineer
Mechanics, design, mechanical analysis,
WP4: Same activities + procurements + quality
S. BRAULT
Design and drawings
WP4: Same activities + procurements + tests
F. CHATELET
Experimental activities and cryogenic tests
WP4: same activities
V. POUX
Quality Manager
WP4: same activities
V. LAURENCIER
Finance management
Procurements
IPNO/IN2P3 support
Equipment
CNRS support
Procurement

29. CSP12
28 Novembre 2014
Thank you for your attention Special thanks to Matthieu Pierens Denis Reynet Sylvain Brault Frédéric Chatelet